Toshiba VF-A7 instruction manual Retry function,  ：Retry selection

6.13.3 Retry function

 ：Retry selection

Warning

Mandatory

･Do not get near the alarm-stopped motor and machine.

When the inverter is in retry mode, the alarm-stopped motor and machine unexpectedly restart when the predetermined time has passed, and thus might cause you to get an injury. ･Stick caution labels to the inverter, the motor and the machine, to prevent accidents due to an unexpected restart of them because of the retry function.

・Function

The inverter automatically resets itself when it has tripped. During a retry, according to the setting of (Auto-restart mode selection) the inverter automatically restarts and this function makes smooth motor activation possible.

[Parameter setting]

	Title		Function		Adjustment range			Default setting
		Retry selection			0: Disabled, ～ times			
Causes of tripping and retry process
	Cause of tripping			Retry process			Canceling conditions
	Momentary		a maximum of 10 consecutive retries			Retry is canceled if the inverter
	power failure		1st retry : about 1 [s] after tripping			trips again for reasons other than a
	Over-current					momentary power failure, over-
	Over-voltage		2nd retry: about 2 [s] after tripping			current, over-voltage or overload,
	Overload		3rd retry : about 3 [s] after tripping			or if the inverter fails to restart
				…		within the predetermined number
			10th retry : about 10 [s] after tripping			of retries.

Kinds of trips can be retried

・，，	：Over-current	・	：Overload of inverter	・	：Over heat
・，，：Over-current of DC injection		・	：Overload of motor
・，，	：Over-voltage	・	：Overload of braking resister

★No retry is performed if the inverter trips for the following reasons:

・,,: Arm short circuit		・ : Interruption communication error
・	: Phase failure(input side)	・ : Gate array fault
・	: Phase failure(output side)	・ : Output current detector error
・	: Loaded side over-current at start time・ : Optional unit fault
・, : Ground-fault		・ : Flash memory fault
・	: Emergency stop	・ : Sink/source switching error
・	: EEPROM error	・ : Speed error (Over speed)
・	: Main RAM error	・ : Key error
・	: Main ROM error	・Others (other than the above)
・	: CPU fault

★During a retry, the fault detection relay (FLA, B and C) is not active.

★A virtual cooling time is set for trips due to an overload (,,). Therefore, a retry is performed after a virtual cooling time and the retry time have passed.

★In the case of a trip due to an over-voltage (～), the inverter may trips again unless the voltage in its D.C. section falls enough.

★In the case of a trip due to overheating (), the inverter may trip again unless the temperature inside it falls enough; the inverter monitors the temperature in it.

★A retry is performed if  is set enabled, even if the trip holding selection parameter  is set at .

★During a retry,  and the value selected with the status monitor selection parameter  are displayed alternately.

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